Magneto armature



1 c. F. SPLITDORF MAGNETO ARMATURE Filed July 50, 1932 FIG./

Patented Oct. 16, 1934 Application July 30, 1932, Serial No. 626,426

1 Claim. (Cl. 171-209) This invention relates to the design of an armature particularly adapted for use in a magneto electric generator such as used for ignition purposes.

I It is the object of my invention to provide an improved method of armature construction by which the coil carrying the primary and secondary windings may be wound independently of the armature and quickly assembled therein 1 around the core, which can be easily and quickly removed from the armature, thereby cheapening the first cost of the armature and providing a structure wherein the coil may be quickly replaced in case of trouble therein.

Another object of my invention is to provide a special type of core which, while being quickly removable to release the coil, is constructed so as to transmit the magnetic flux lines through the coil in a highly efficient manner, thereby improving the general electrical efliciency of the armature.

These and other objects will be apparent to one skilled in this art from a study of the specification taken in connection with the annexed "drawing, wherein:

Figure l is a side-elevation of my improved form of armature.

Figure 2 is a section on the line 2--2 of Figure 1. Figure 3 is a sectional View through the core structure.

Figure 4 is a view on the line 44 of Figure 3.

In the drawing, wherein like numbers refer to corresponding parts in the various views, 1 and 2 are the pole pieces of the armature constructed of suitable magnetic material such as soft steel. The pole pieces 1 and 2 are fastened to endplates 3 and 4 in any satisfactory manner. The end-plate 3 has fastened thereto a shaft member 5, while the end-plate 4 has a shaft member'fi also suitably fastened thereto.

The bearings and support members for the shafts 5 and 6, as well as the field structure in which the armature rotates are not shown and described as these parts are old and well-known.

The armature pole piece 1 is threaded at 7, while the armature pole piece 2 has an annular recess 8 positioned diametrically opposite the threaded hole 7 in the pole piece 1. The core ex- ;tending between the pole pieces 1 and 2 comprises a tubular member 9 preferably of soft steel, and as shown in Figure 3, one end of the tubular member 9 is enlarged and threaded at 10 and pro- "vided with a screw-slot 11 by which the tube 9 1 may be screwed into position as shown in Figures 1 and 2. The opposite end 12 of the tube 9 is adapted to fit in the recess 8 in the pole piece 2 when the tube 9 is screwed into position.

The tube 9, comprising part of the core, is filled with magnetic material 13 preferably in the form of a single thin strip which is wound up like a clock-spring and slipped into position within the tube 9. The hole 14 for the mandrel around which the core element 13 is wound, may be filled, if desired, with a pin preferably of magnetic material after the member 13 has been inserted into the tube 9. However, I prefer to leave the opening l4 to provide ventilation from the opening 14 into the recess 8 in the pole piece 2. While the strip of material 13 may be of good grade iron or soft steel, I prefer to use an alloy of iron and nickel which has high permeability and low hysteresis losses, and by making the core in the manner described, I have found that I can get a greater cross-section of magnetic material in the tube 9, instead of by filling the tube 9 with a 1 bundle of fine iron wires, because of the interstices between the different wires; Whereas, the convolutions of the strip material lie in actual contact one with the other, with no space therebetween.

In the usual form of the Siemens magneto armature, each armature must be wound by itself and it is rather a slow and tedious operation because of the care that must be exercised during the hand-winding process. With my improved as construction, the coil generally referred to by the numeral 15 and composed of a primary winding 16 and a secondary winding 17 suitably insulated one from the other, can be wound on an automatic winding machine wherein quite a number of coils can be wound on the same mandrel, which is the practice in making coils used with battery ignition systems. After the coil has been thus wound, it is ready for assembly in the armature along with the core 9 in the manner described.

As shown in Figure 1, the outside end of the secondary is illustrated at 18, while the grounded end of the primary and secondary may be illustrated by either of the wires 19 or 20, the other being the end of the primary going into the circuit breaker.

These detail connections and associated parts are old and well-known and are therefore not described, for as has been stated, my invention resides in the method of constructing the armature by having a special type of core which is quickly and easily removable, whereby the coil may be independently wound and readily assembled, thereby cheapening the entire cost of the 1'10' construction of the armature as well as improving its electrical characteristics.

While I have shown and described an ordinary form of high-tension coil, composed of primary and secondary windings, for the armature, the coil may be composed of only one winding having suitable characteristics if the armature is to I be used in a low-tension ignition generator.

Perhaps it should be mentionednthat the ironnickel alloy to which reference hasv'been made and which I prefer to use, is preferably of the type disclosed in Patent 1,807,021, iSSued'May ZGQ 1931, and known to the trade as Hipernik. .31,:

irrounding said core between the pole pieces.

Having thus described my invention, [what claim is:

CHARLES F. SPLITDORF. 

